Skip to content

Instantly share code, notes, and snippets.

@AndriiShtoiko

AndriiShtoiko/.block

Created February 23, 2019 15:23
Show Gist options
  • Save AndriiShtoiko/036d460fb1b377ae9a7021f31a5a51df to your computer and use it in GitHub Desktop.
Save AndriiShtoiko/036d460fb1b377ae9a7021f31a5a51df to your computer and use it in GitHub Desktop.
Download ZIP
Brush and Zoom 2
Raw
.block
license: mit
Raw
index.html
<!DOCTYPE html>
<head>
<meta charset="utf-8">
<script src="https://d3js.org/d3.v5.min.js"></script>
<style>
.line {
fill: none;
stroke: steelblue;
stroke-width: 1.5px;
}
.zoom {
cursor: move;
fill: none;
pointer-events: all;
}
</style>
</head>
<body>
<svg width="873" height="500"></svg>
<script>
//Brush and zoom based off:
//https://bl.ocks.org/EfratVil/92f894ac0ba265192411e73f633a3e2f
var data = [];
//var data = [{"depthNum":0,"depth":4},{"depthNum":1,"depth":8},{"depthNum":2,"depth":10},{"depthNum":3,"depth":11},{"depthNum":4,"depth":15},{"depthNum":5,"depth":19},{"depthNum":6,"depth":22},{"depthNum":7,"depth":23},{"depthNum":8,"depth":30}];
var innerHeight=607;
var innerWidth=250;
var svg = d3.select("svg");
var margin = {top: 20, right: 20, bottom: 110, left: 40};
var margin2 = {top: 436, right: 20, bottom: 30, left: 40};
var width = +svg.attr("width") - margin.left - margin.right;
var width2 = +svg.attr("width") - margin2.left - margin2.right;
var height = +svg.attr("height") - margin.top - margin.bottom;
var height2 = +svg.attr("height") - margin2.top - margin2.bottom;
//from developer.mozilla.org
function getRandomArbitrary(min, max) {
return Math.random() * (max - min) + min;
}
function genPoints(j){
var data = [];
var ranMin = 0;
var ranMax = 2000;
for(i=0;i<j;i++)
{
var ranDep = getRandomArbitrary(ranMin,ranMax);
data.push(
{
"depthNum":i,
"depth":ranDep
}
);
}
render(data);
}
var xScale = d3.scaleLinear().range([0, width]);
var xScale2 = d3.scaleLinear().range([0, width]);
var yScale = d3.scaleLinear().range([height, 0]);
var yScale2 = d3.scaleLinear().range([height2, 0]);
//console.log(xScale);
var xAxis = d3.axisBottom(xScale),
xAxis2 = d3.axisBottom(xScale2),
yAxis = d3.axisLeft(yScale),
yAxis2 = d3.axisLeft(yScale2);
var brush = d3.brushX()
.extent([[0, 0], [width, height2]])
.on("brush end", brushed);
var zoom = d3.zoom()
.scaleExtent([1, Infinity])
.translateExtent([[0, 0], [width, height]])
.extent([[0, 0], [width, height]])
.on("zoom", zoomed);
var line = d3.line()
.x(function (d) { return xScale(d.depthNum); })
.y(function (d) { return yScale(d.depth); });
var line2 = d3.line()
.x(function (d) { return xScale2(d.depthNum); })
.y(function (d) { return yScale2(d.depth); });
var clip = svg.append("defs").append("svg:clipPath")
.attr("id", "clip")
.append("svg:rect")
.attr("width", width)
.attr("height", height)
.attr("x", 0)
.attr("y", 0);
var Line_chart = svg.append("g")
.attr("class", "focus")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")")
.attr("clip-path", "url(#clip)");
var focus = svg.append("g")
.attr("class", "focus")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var context = svg.append("g")
.attr("class", "context")
.attr("transform", "translate(" + margin2.left + "," + margin2.top + ")");
function render(data){
xScale.domain(d3.extent(data, function(d) { return d.depthNum; }));
yScale.domain([0, d3.max(data, function (d) { return d.depth; })]);
xScale2.domain(xScale.domain());
yScale2.domain(yScale.domain());
focus.append("g")
.attr("class", "axis axis--x")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
focus.append("g")
.attr("class", "axis axis--y")
.call(yAxis);
Line_chart.append("path")
.datum(data)
.attr("class", "line")
.attr("d", line);
context.append("path")
.datum(data)
.attr("class", "line")
.attr("d", line2);
context.append("g")
.attr("class", "axis axis--x")
.attr("transform", "translate(0," + height2 + ")")
.call(xAxis2);
context.append("g")
.attr("class", "brush")
.call(brush)
.call(brush.move, xScale.range());
svg.append("rect")
.attr("class", "zoom")
.attr("width", width)
.attr("height", height)
.attr("transform", "translate(" + margin.left + "," + margin.top + ")")
.call(zoom);
}
genPoints(100);
function brushed() {
if (d3.event.sourceEvent && d3.event.sourceEvent.type === "zoom") return; // ignore brush-by-zoom
var s = d3.event.selection || xScale2.range();
xScale.domain(s.map(xScale2.invert, xScale2));
Line_chart.select(".line").attr("d", line);
focus.select(".axis--x").call(xAxis);
svg.select(".zoom").call(zoom.transform, d3.zoomIdentity
.scale(width / (s[1] - s[0]))
.translate(-s[0], 0));
}
function zoomed() {
if (d3.event.sourceEvent && d3.event.sourceEvent.type === "brush") return; // ignore zoom-by-brush
var t = d3.event.transform;
xScale.domain(t.rescaleX(xScale2).domain());
Line_chart.select(".line").attr("d", line);
focus.select(".axis--x").call(xAxis);
context.select(".brush").call(brush.move, xScale.range().map(t.invertX, t));
}
//genLine(10);
//console.log(data);
</script>
</body>
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment